31039961 has 4 divisors (see below), whose sum is σ = 31503312. Its totient is φ = 30576612.

The previous prime is 31039933. The next prime is 31039963. The reversal of 31039961 is 16993013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31039961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31039963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231575 + ... + 231708.

It is an arithmetic number, because the mean of its divisors is an integer number (7875828).

Almost surely, 2^31039961 is an apocalyptic number.

It is an amenable number.

31039961 is a deficient number, since it is larger than the sum of its proper divisors (463351).

31039961 is an equidigital number, since it uses as much as digits as its factorization.

31039961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463350.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 31039961 is about 5571.3518108265. The cubic root of 31039961 is about 314.2729886917.

The spelling of 31039961 in words is "thirty-one million, thirty-nine thousand, nine hundred sixty-one".